NAA starting problem

[jeffkoh]

hello, my naa starts and runs great in the warm weather, it runs great in the cold weather too. the problem is getting it started in the cold weather,(below 30 deg.). if i prime the cylinders it fires right up and will start on its own once its warm. if it sits overnight i have to prime it again. the carb does get cleaned on a regular basis. i know the carb is getting gas, it starts to drip after a few seconds of cranking and not firing. any suggestions?

 

[Ultradog MN]

What do you mean by prime the cylinders?

 

[jeffkoh]

i sqeeze a little bit of gas in the cylinders.

 

[Ultradog MN]

I kind of thought that but wasn't sure.
My first guess is how is the compression on the engine? If the rings are loose or valves bad it won't suck all that good air and fuel very well.

 

[jeffkoh]

i have never checked the compression with a guage, but the tractor has plenty of power and doesnt burn any oil. i plow and disk with it every summer and push snow in the winter. never had a problem.

 

[souNdguy]

Hmm.. have to clean the carb alot.. that't aint a good sign.

what's the compression?

how are the sparks?

soundguy

 

[sundvl76]

Based on my experience, I'd recommend spending some time bringing the ignition system up to snuff, including cleaning ALL lead connections including grounds, and at least cleaning and re-gapping the plugs. My 8N used to start hard but ran great until I went thru the system end-to-end. Now it starts instantly, not even needing a choke from a cold start in warmer weather. I also replaced the ignition switch, even tho the old one seemed to work - probably weak. (I'm not saying just throw parts at it, but carefully inspect each component.)

 

[jeffkoh]

cleaning the carb on a regular basis is once a year. its not like its plugging up. i will check the compression, what should it be?

 

[souNdguy]

My point is.. cleaning the carb is not 'normal' periodic maintenance.. like changing the oil.. IE.. things you do once a year.. or so.

I have tractors i've -never- cleaned the carb on.. and many that go years between cleanings.. and only then when they get dirty.

soundguy

 

[old]

You may have a small manifold leak that when cold opens up more so it sucks air instead of gas. What happens if you hold your hand over the air intake of the carb?? You should get a good suction there and also get gas on your hand. If that helps it start then you may have a choke that does not close like it should or even have a choke flap that is missing its spring and or its little flap

 

[Jubilee85 (VA)]

Book calls for min. 90 Psi across each .....have run with less, but less will make starting a chore. Check dry then with tsp of oil down each sparkie hole and check again.

 

[jeffkoh]

checked compression today, 95,75,75,100. thats a start.

 

[Dave in MS]

(quoted from post at 18:40:48 12/30/09) checked compression today, 95,75,75,100. thats a start.

Did you check it dry or with oil in the cyls.? If dry, check again with a teaspoon of oil in each cylinder. If you get the same results wet, your valves or the head gasket could be leaking. If the numbers go up, you may have some bad rings. Try retorquing the head when it's cold then run it til it's warm and check the torque again, then see if your compression improves.

 

[Anonymous-0]

Center cylinders running 75 could be a cylinder to cylinder head gasket leak.

 

[Anonymous-0]

My name was in the message,your computer is constipated again.

 

[Dave in MS]

(quoted from post at 18:51:15 01/02/10) My name was in the message,your computer is constipated again.

Who's computer are you talking about?